gnu: Remove rust-rav1e.

This package is superseded by rav1e.

Note: I tried defining an alias like so:

  (define-public rust-rav1e
    (deprecated-package "rust-rav1e" rav1e))

But it caused a problem where the 'rav1e' variable would appear unbound.

* gnu/packages/crates-graphics.scm (rust-rav1e-0.4): Remove.

gnu/packages/crates-graphics.scm

@@ -1949,75 +1949,6 @@ interactive applications.")
         ("rust-glob" ,rust-glob-0.2)
         ("rust-term" ,rust-term-0.4))))))
 
-(define-public rust-rav1e-0.4
-  (package
-    (name "rust-rav1e")
-    (version "0.4.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "rav1e" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "02cpgzycfgnflnv8sck6ajasa7abfgdzn6b4jv01sf6r21yfipbq"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:skip-build? #t
-       #:cargo-inputs
-       (("rust-aom-sys" ,rust-aom-sys-0.2)
-        ("rust-arbitrary" ,rust-arbitrary-0.4)
-        ("rust-arg-enum-proc-macro" ,rust-arg-enum-proc-macro-0.3)
-        ("rust-arrayvec" ,rust-arrayvec-0.5)
-        ("rust-assert-cmd" ,rust-assert-cmd-1)
-        ("rust-av-metrics" ,rust-av-metrics-0.6)
-        ("rust-backtrace" ,rust-backtrace-0.3)
-        ("rust-bitstream-io" ,rust-bitstream-io-1)
-        ("rust-byteorder" ,rust-byteorder-1)
-        ("rust-cc" ,rust-cc-1)
-        ("rust-cfg-if" ,rust-cfg-if-1)
-        ("rust-clap" ,rust-clap-2)
-        ("rust-console" ,rust-console-0.14)
-        ("rust-criterion" ,rust-criterion-0.3)
-        ("rust-crossbeam" ,rust-crossbeam-0.8)
-        ("rust-dav1d-sys" ,rust-dav1d-sys-0.3)
-        ("rust-fern" ,rust-fern-0.6)
-        ("rust-image" ,rust-image-0.23)
-        ("rust-interpolate-name" ,rust-interpolate-name-0.2)
-        ("rust-itertools" ,rust-itertools-0.10)
-        ("rust-ivf" ,rust-ivf-0.1)
-        ("rust-libc" ,rust-libc-0.2)
-        ("rust-libfuzzer-sys" ,rust-libfuzzer-sys-0.3)
-        ("rust-log" ,rust-log-0.4)
-        ("rust-nasm-rs" ,rust-nasm-rs-0.2)
-        ("rust-noop-proc-macro" ,rust-noop-proc-macro-0.3)
-        ("rust-num-derive" ,rust-num-derive-0.3)
-        ("rust-num-traits" ,rust-num-traits-0.2)
-        ("rust-paste" ,rust-paste-1)
-        ("rust-pretty-assertions" ,rust-pretty-assertions-0.6)
-        ("rust-rand" ,rust-rand-0.8)
-        ("rust-rand-chacha" ,rust-rand-chacha-0.3)
-        ("rust-rayon" ,rust-rayon-1)
-        ("rust-regex" ,rust-regex-1)
-        ("rust-rust-hawktracer" ,rust-rust-hawktracer-0.7)
-        ("rust-rustc-version" ,rust-rustc-version-0.3)
-        ("rust-scan-fmt" ,rust-scan-fmt-0.2)
-        ("rust-serde" ,rust-serde-1)
-        ("rust-signal-hook" ,rust-signal-hook-0.3)
-        ("rust-simd-helpers" ,rust-simd-helpers-0.1)
-        ("rust-thiserror" ,rust-thiserror-1)
-        ("rust-toml" ,rust-toml-0.5)
-        ("rust-v-frame" ,rust-v-frame-0.2)
-        ("rust-vergen" ,rust-vergen-3)
-        ("rust-wasm-bindgen" ,rust-wasm-bindgen-0.2)
-        ("rust-y4m" ,rust-y4m-0.7))))
-    (home-page "https://github.com/xiph/rav1e")
-    (synopsis "Fast and safe AV1 encoder")
-    (description
-     "@code{rav1e} is an AV1 video encoder.  It is designed to eventually
-cover all use cases, though in its current form it is most suitable for cases
-where libaom (the reference encoder) is too slow.")
-    (license license:bsd-2)))
-
 (define-public rust-ravif-0.6
   (package
     (name "rust-ravif")